Cable-drum mechanism.



'-Nu. 873,781Y y PATENTED DEC. 17, 1907.

` 0. PIRTLBL.' y

l.CABLE DRUM MBGHANISM.

APPLIIOATION FILED MAE. 61190-7.

my A

CABLE-DRUM tiiioiieiiism;

its. 373,731.

Specification of Letters Fatent.

Palanga time. 17 19o? Applicotiou'led Hatch 6; M907. Serial No. ll,

To all whom it may oncem:

Be it known that l, CLMBQRNE FIRTLE, n citizen ot the United States of Azzierioe, riz-- si lg et Cleveland, in the oounty ol Cuyo liege. and State oi (lino, have invented o1' discovered new and useful uipiovsments in Cable-Drum Eileelifiuisms, oi' 'which the folloisf'ing is a specification.

On hoisting mechanisms it is often advisable to have in addition to the hoisting Cable, n, second cable Connected to the lioi'st hook, 'the grob bucket, the ,lifting iiiagnet tlie oar, or other load, handled by the hoisting meehzmism.- Said second Cable muy be used for lending current to e, liftingy nie-guet, o1' to visible, or audit-le signals or to? energizing any electrical a )parat-us, which travels with the li .sling en ie or is stetiomiiy sind must i eoeive current at a certain point oi' points oi' to? certain periods in the travel oi' the hoist. Suid second esole need not emry surfent and may lie used to mechanically opei'ate Various devices situated ou or nem' the hoist rope or suspended from it. Said eztlile es desoiibeil above will be iei'erecl to herein :is the eine iliery oe'ole. lt is evident that movement of the auxiliary cable must lie synchronous with that of the lioist cable. At the present time itis common practice to operate the auxiliary exilile from a. drum, other 'then the hoist iii-um, through n, positive connection to the hoist drum. This connection is usually moule by sprocket wheels and chain or by gears driven iiom some shaft in tile hoisting mechanism. lven where the auxiliary cable (imm ili'ven from tlie main hoist drum, it luis been found impossible in practice to get this connection {wom-lite enough te Couso the euliles to move in syiielironism, and to get zippi'oxiuuite s vuvluonism each auxiliary onlile drum must be .lesigueil for the )ein tioullu' hoisting` 'meoluuiism with which 1t is to opoiote. Even with eli-refill design, it luie been lofmil that the leek of sym-lironism oeiweeii the mein and auxiliary cables subjects the auxiliary oelile to strains that often pmt it or breuk the gen1-ing between the mein and eu2tiliau' ,f cable drums. 'lo prevent this a largo loop must lio left in the suxililiry cable, Whitli is :il objectionable mul often im lliliitive.

The olijeot of my invention is te provide a, miele-drum mechanism, which is generally applicable without special design to all types olilioistiui; lzizieiiiues; which is independent oi" the uuwuiue. with which. it is to operate and Hwy be plaeed eitlie on the machine erin any other vconvenient location, which will Cause tile auxilifuy cable to move absolute synolirouism with the mein o1 lewe Se oublie., thus :wei/lieg any loop in the au.4 .ilary solo e; which w' loifevoiit any uiiflue steiiis iii the iiuxilisu oa le or oablolrum machen ism; sind which Will keep en .sven tension-iii the ou mary Goble ii'respeotive of the ositioii or direction of motion of the mao iiiie with which it is opooting.

Referring to the distwing soc-omino@ flug' this speeicatioo, Figui-s l is e.. sido elevation illistsetiiig one form o" my in' tieni Fig, 2, if. similar View illustretiiig-; seeooa'i f1 flip.' thereof; Figli, n :side elevstion of a, showing my' invention. apwlieil te tlm t; i, thereof; Fig. 4, ai similarelevetioirielioiffmg, modification oi' Wig. 3; and liig. 5, loiigim It tuolinal seetioii o .lum showri on i. Relerriiw to l1 i, is mi eleotio moto?, whose shaft ooii'ies the pinion. meshing with the gom-iilieel il en the shaft l?? of tile cable-diem E. This d. um luis deep gi'oovo Si) extending from its periplieiy tower' f its oeules' or exis. The fiable is Wound in e. liet spirali in seid groove end s. w 1.? .ieotiie comiiiotois e" Whose in. f eoiiiieeteil. to the iospoetivfesliA rieti in the liub of the (imm. lieve sliding commet wi' vliieli. eine eoimotei'i the One of the supply wires G, d the moto? [i oomoiiie the which is 'permanently iii series with the inoy toi' and of 'suoli a, velue. es to allow only o sate current for the motor lo flow even with the motor stalled, anni to limit the torque to predetermined vsi. .ie et all. times, wliioli 95. value must be suflieielt to rota-te the drum' E euml mel in tile osfole when 'the load te which the oel'ile attached iises o1 mov/.5s so as to temi to sin-aken the collie, but its is-lue may, of eourse, be greater, if clesiiecl, so :is to oid in tlie movement of the load. 'Tl-le duty ot' the moto? is to feel up the lilo` when tlm movement of the lead will -"mit it to rotate, and it may elo slilitioiml i'foil: @it the option of the constructor.

if the hoist be ascending, rotate and take up thel emilion? GableV in synehroiiism with the main or powoi' cable 1f the hoist lie descending, the motoi* being. tonnen-teil tolie riveli "oy eui'reiit only one direction, the auxiliary eti-lilo will dro-g the l motor backward. 'Tl-.ius in; either di'eetio of motion, the auxiliary cable moves in perfeet syncln'onisni with the :mein or power cable and no Aloop is requiietl or permitted. Since the iesistoncc C# is pi'opoitiouod. so as to aiiow only e definito curit- 1 torque oi the inotoi .fi i stent and. consequen auxilini'y cable sp`no..\.ineteiy constant.

It wiil be olisoiveii that in Fig. 'Jtlie cable ruin is in tinforni of a reel, the cable wind.- ing on itseif. 'which is the piefciotile forni when the euriilisry csole is in the vei'ticztl position.y

Fie'. shows e cable drum E" in the 'Yorin of a iorizontel eylinzlci', which is 'the preisvable foin] Where 'the auxiliary cable is in Lilie horizontal position. l

Gn Fig. 3, l have shown my invention spplied to an electric traveling crime, the cable- :difuzn E and its'di'iving mechenism being 'mounted u' on thc trolley T, movable along the bridge i". The drum E is used to psy in .and out the electric cable l, conveying our rent to the liiy'tin segnet M, which is connected to the cab eN leading to the hoisting drum O carried by the ti'olley T and driven bythe motor P.- f In Fig. fi, the cslile-drum E with its dmv .ing mechanism is located. on the billige T .while the cable C entends out in., izontslly 'from the drum and. then down over the idle fpulle f R. on the ti'olley to the nisgnet M,

Whio is suspended as shown in Fig. 3. Tne ceblewlrum must, in 4:, compensate for;- 'both the travel of the ioeii enel the trevel of the tioley f f 'it is obvious thst other forms of my' inven avessi tion besides those shown in Figs. and 2 might ce adopted end that many other applicetions tlieeoi' then those shown in Figs. 3 and 4 might be made. For example, l might use tric caba-drum mechanism es s. counter-belence,v since' the torque ci the niotor may be adjusted to take up more than the Weight of the cable.

l claim-.-

l. A tension device 4for cablesY embracing c drum, im el ectic motor having its rotatable member connected in driving1 'relation to seid drum, and e insistence permanently in circuit with seid motor in such manner as to limit the torque oi said motor.

2. In sn eutometic tension device for caibles, the combination ci a-rotstable eeblewinding ldevice, en electric motor for driving seid Winding device in suc-li manner as to vtelic up the slack es it occurs ontlie cable,

andmesns for limiting the tor ne of said. motor to a constant maximum va ue.

3. InnJ hoisting device, the combination of a lifting magnet carried 'by the seid hoisting.

device, s cable ioi supplying electric current to said liftin magnet, a Winding device for taking in en psyingout seid. cable, en elec tric motor 'tending to drive seid. winding device in such e direction as to maintain e ten sion in seid cable, and ineens foi"limiting the torque of seid motor. A

Signed at Cleveland, Gino, this oLAiBoRNE HRTLE.

v1st dey of Witnesses z" A... C. EAsTWoon, J. H.' HALL. 

